1.Half an hour had gone by ,but the last bus hadn't come. We had to go home on foot.
①half an hour半小时
go by过去
the last bus末班车
②过去完成时
③逗号不能连接两个句子，用but连接
2.Mary looks very worried about the Chinese exam, because she hasn't learn the text by heart.
①主干：玛丽担心汉语考试
原因：没背熟课文
②用第三人称
③用because连接
④背熟 learn……by heart
对……担心 be worried about……
3.Since the basketball match has been postponed, let's go to visit the museum.
①主干：篮球赛被推迟，去参观博物馆
②现在完成时
③postpone 推迟
4.During the World War Ⅱ, he stayed in Australia with his parents all the way.
①主干：他和父母住在澳大利亚
②在……期间用during
③过去时
5.Since I graduated from the NanJing University in 1985,I have kind of lost touch with my college classmates.
①主干：我与我的大学同学失去了联系
②用since引导
③失去联系 lose touch with
护理八班 孟宇星 2019109237
